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<document ID-DOI="http://dx.doi.org/10.3897/zookeys.197.1728" ID-GBIF-Dataset="42b66d62-b295-44c0-9368-cf4154fddc3b" ID-PMC="PMC3376724" ID-Pensoft-Pub="1313-2970-197-1" ID-PubMed="22711992" ModsDocAuthor="" ModsDocDate="2012" ModsDocID="1313-2970-197-1" ModsDocOrigin="ZooKeys 197" ModsDocTitle="Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda)" checkinTime="1451248993568" checkinUser="pensoft" docAuthor="Yonow, Nathalie" docDate="2012" docId="10CF483BABE8EBECC54F7A4734B48431" docLanguage="en" docName="ZooKeys 197: 1-129" docOrigin="ZooKeys 197" docSource="http://dx.doi.org/10.3897/zookeys.197.1728" docTitle="Plakobranchus ocellatus van Hasselt 1924" docType="treatment" docVersion="3" lastPageNumber="16" masterDocId="FFC4DD6FFFA0AE7CFF89A90FFFBCF766" masterDocTitle="Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda)" masterLastPageNumber="130" masterPageNumber="1" pageNumber="15" updateTime="1668153941066" updateUser="ExternalLinkService">
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<mods:title>Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda)</mods:title>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Yonow, Nathalie</mods:namePart>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:title>ZooKeys</mods:title>
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<mods:date>2012</mods:date>
<mods:detail type="volume">
<mods:number>197</mods:number>
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<mods:end>130</mods:end>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.197.1728</mods:identifier>
<mods:identifier type="Pensoft-Pub">1313-2970-197-1</mods:identifier>
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<treatment ID-GBIF-Taxon="152035788" LSID="urn:lsid:plazi:treatment:10CF483BABE8EBECC54F7A4734B48431" httpUri="http://treatment.plazi.org/id/10CF483BABE8EBECC54F7A4734B48431" lastPageId="15" lastPageNumber="16" pageId="14" pageNumber="15">
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<taxonomicName LSID="http://species-id.net/wiki/Plakobranchus_ocellatus" authority="van Hasselt, 1924" authorityName="van Hasselt" authorityYear="1924" class="Gastropoda" family="Plakobranchidae" genus="Plakobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Plakobranchus ocellatus" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="ocellatus">Plakobranchus ocellatus van Hasselt, 1924</taxonomicName>
Plate 17
</paragraph>
</subSubSection>
<subSubSection pageId="14" pageNumber="15" type="reference_group">
<paragraph pageId="14" pageNumber="15">
<taxonomicName class="Gastropoda" family="Plakobranchidae" genus="Plakobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Plakobranchus ocellatus" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="ocellatus">Plakobranchus ocellatus</taxonomicName>
. -
<bibRefCitation author="Yonow, N" journalOrPublisher="Fauna of Saudi Arabia" pageId="67" pageNumber="68" pagination="286 - 299" title="Red Sea Opisthobranchia. 3. The orders Sacoglossa, Cephalaspidea, and Nudibranchia: Doridacea (Mollusca, Opisthobranchia)." volume="11" year="1990">Yonow 1990</bibRefCitation>
: 288, pl. 2 (Red Sea);
<bibRefCitation author="Apte, D" journalOrPublisher="Journal Bombay Natural History Society" pageId="64" pageNumber="65" pagination="162 - 175" title="Opisthobranch fauna of Lakshadweep Islands, India, with 52 new records to Lakshadweep and 40 new records to India: part 1." volume="106" year="2009">Apte 2009</bibRefCitation>
: 169, fig. 2a (Laccadive Islands);
<bibRefCitation author="Richmond, MD" journalOrPublisher="Sida / SAREC-UDSM, Sweden" pageId="66" pageNumber="67" title="A Field Guide to the Seashores of Eastern Africa and the Western Indian Ocean Islands, 3 rd edition." year="2011">Richmond 2011</bibRefCitation>
: 276 (East Africa).
</paragraph>
<paragraph pageId="14" pageNumber="15">
<taxonomicName class="Gastropoda" family="Plakobranchidae" genus="Placobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Placobranchus ocellatus" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="ocellatus">Placobranchus ocellatus</taxonomicName>
. -
<bibRefCitation pageId="14" pageNumber="15">Rao 1962</bibRefCitation>
: 1, figs. 1, 2e, f (India);
<bibRefCitation author="Jensen, KR" journalOrPublisher="Journal Molluscan Studies" pageId="66" pageNumber="67" pagination="257 - 296" title="Anatomy of some Indo-Pacific Elysiidae (Opisthobranchia: Sacoglossa: Ascoglossa), with a discussion of the generic divisions and phylogeny." url="10.1093/mollus/58.3.257" volume="58" year="1992">Jensen 1992</bibRefCitation>
: 283, figs. 23, 24d, e (Red Sea and SW Thailand + Guam, Hawaii).
</paragraph>
</subSubSection>
<subSubSection pageId="14" pageNumber="15" type="material">
<paragraph pageId="14" pageNumber="15">Material.</paragraph>
<paragraph pageId="14" pageNumber="15">
Kenya: 25
<normalizedToken originalValue="×">x</normalizedToken>
11 mm preserved, Vipingo, 25 miles N of Mombasa, rock pool ELW, 23 September 1984, leg. J Hognerud. - Maldives: 9 mm in length (MDV/AB/96/7, specimen disintegrated, no radula located), Fulidhoo Lagoon, Felidhoo Atoll, 10 m depth on sand, 04 May 1996, leg. RC Anderson &amp; SG Buttress. - Zanzibar: 14
<normalizedToken originalValue="×">x</normalizedToken>
8 mm preserved, Matemwe Lagoon, in
<taxonomicName class="Insecta" family="Curculionidae" genus="Xenia" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Xenia" order="Coleoptera" pageId="14" pageNumber="15" phylum="Arthropoda" rank="genus">Xenia</taxonomicName>
sp. and sand near encrusted, partly submerged rock with
<taxonomicName class="Ascidiacea" family="Didemnidae" genus="Didemnum" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Didemnum molle" order="Aplousobranchia" pageId="14" pageNumber="15" phylum="Chordata" rank="species" species="molle">Didemnum molle</taxonomicName>
and
<taxonomicName class="Ulvophyceae" family="Halimedaceae" genus="Halimeda" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Halimeda" order="Bryopsidales" pageId="14" pageNumber="15" phylum="Chlorophyta" rank="genus">Halimeda</taxonomicName>
sp., 01 March 1995, leg. MD Richmond. - Seychelles: 30
<normalizedToken originalValue="×">x</normalizedToken>
10 mm alive (PK-A, one of four individuals preserved), Source
<normalizedToken originalValue="dArgent">d'Argent</normalizedToken>
, La Digue, 1 m depth on broken
<taxonomicName class="Anthozoa" family="Acroporidae" genus="Acropora" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Acropora" order="Scleractinia" pageId="14" pageNumber="15" phylum="Cnidaria" rank="genus">Acropora</taxonomicName>
sp. behind reef in algal growth, 26 January 1992, leg. P Kemp. - La
<normalizedToken originalValue="Réunion">Reunion</normalizedToken>
and Mayotte: photographs of several individuals http://seaslugs.free.fr/nudibranche/a_intro.htm.
</paragraph>
</subSubSection>
<subSubSection lastPageId="15" lastPageNumber="16" pageId="14" pageNumber="15" type="description">
<paragraph pageId="14" pageNumber="15">Description/Distribution.</paragraph>
<paragraph lastPageId="15" lastPageNumber="16" pageId="14" pageNumber="15">
<taxonomicName class="Gastropoda" family="Plakobranchidae" genus="Plakobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Plakobranchus ocellatus" pageId="14" pageNumber="15" phylum="Mollusca" rank="species" species="ocellatus">Plakobranchus ocellatus</taxonomicName>
has been recorded in excess of 35 mm in the Indian Ocean (
<bibRefCitation pageId="14" pageNumber="15">Rao 1962</bibRefCitation>
). The western Indian Ocean specimens e
<pageBreakToken pageId="15" pageNumber="16" start="start">xamined</pageBreakToken>
here conform to the description of Red Sea specimens (
<bibRefCitation author="Yonow, N" journalOrPublisher="Fauna of Saudi Arabia" pageId="67" pageNumber="68" pagination="286 - 299" title="Red Sea Opisthobranchia. 3. The orders Sacoglossa, Cephalaspidea, and Nudibranchia: Doridacea (Mollusca, Opisthobranchia)." volume="11" year="1990">Yonow 1990</bibRefCitation>
, 2008).
<bibRefCitation author="Jensen, KR" journalOrPublisher="Journal Molluscan Studies" pageId="66" pageNumber="67" pagination="257 - 296" title="Anatomy of some Indo-Pacific Elysiidae (Opisthobranchia: Sacoglossa: Ascoglossa), with a discussion of the generic divisions and phylogeny." url="10.1093/mollus/58.3.257" volume="58" year="1992">Jensen (1992)</bibRefCitation>
listed numerous synonyms from the Pacific Ocean, stating that colour pattern and distribution of ocelli are variable in just a single species; however, in 2006 she suggested, &quot;It is possible that a complex of sibling species is involved.&quot;
</paragraph>
</subSubSection>
<subSubSection pageId="15" pageNumber="16" type="remarks">
<paragraph pageId="15" pageNumber="16">Remarks.</paragraph>
<paragraph pageId="15" pageNumber="16">
In the Marshall Islands, an interesting commensal association was observed between
<taxonomicName class="Gastropoda" family="Plakobranchidae" genus="Plakobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Plakobranchus ocellatus" pageId="15" pageNumber="16" phylum="Mollusca" rank="species" species="ocellatus">Plakobranchus ocellatus</taxonomicName>
and the sea cucumber
<taxonomicName class="Holothuroidea" family="Holothuriidae" genus="Holothuria" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Holothuria atra" order="Holothuriida" pageId="15" pageNumber="16" phylum="Echinodermata" rank="species" species="atra">Holothuria atra</taxonomicName>
(
<bibRefCitation author="Mercier, A" journalOrPublisher="Cahiers de Biologie Marine" pageId="66" pageNumber="67" pagination="399 - 402" title="Note on the association between Plakobranchus ocellatus (Mollusca: Gastropoda: Opisthobranchia) and Holothuria atra (Echinodermata: Holothuroidea)." volume="46" year="2005">Mercier and Hamel 2005</bibRefCitation>
); this is the first report of an opisthobranch occurring on an echinoderm species. The authors provide evidence of a real association between the two animals through a set of well-designed experiments and natural observations. In the Indian Ocean
<taxonomicName class="Holothuroidea" family="Holothuriidae" genus="Holothuria" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Holothuria atra" order="Holothuriida" pageId="15" pageNumber="16" phylum="Echinodermata" rank="species" species="atra">Holothuria atra</taxonomicName>
is also a common species, with a similar habitat to
<taxonomicName class="Gastropoda" family="Plakobranchidae" genus="Plakobranchus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Plakobranchus ocellatus" pageId="15" pageNumber="16" phylum="Mollusca" rank="species" species="ocellatus">Plakobranchus ocellatus</taxonomicName>
, but there are no observations of a similar association.
</paragraph>
</subSubSection>
</treatment>
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